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照着例子写了一个简单的libevent hello world代码：
#include <sys/signal.h> #include <event.h> void signal_cb(int fd, short event, void *arg) { event_base *base = (event_base*) arg; timeval delay = {2, 0}; printf("Caught an interrupt signal, exit in 2 sec...\n"); event_base_loopexit(base, &delay); } void timeout_cb(int fd, short event, void *arg) { printf("timeout\n"); } int main() { event_base *base = event_init(); event *signal_event = evsignal_new(base, SIGINT, signal_cb, base); event_add(signal_event, NULL); timeval tv = {1, 0}; event * timeout_event = evtimer_new(base, timeout_cb, NULL); event_add(timeout_event, &tv); event_base_dispatch(base); event_free(timeout_event); event_free(signal_event); event_base_free(base); }
Makefile的内容：
lhello : lhello.cpp
g++ -o lhello lhello.cpp -levent -L/usr/local/lib -Wl,-rpath=/usr/local/lib
运行程序：
$ ./lhello timeout ^CCaught an interrupt signal, exit in 2 sec...
显示经过1秒，显示timeout，然后Ctrl+C之后，会打印提示，并且等待2秒后退出。
注意，在程序中初始化event使用了两个不同的函数，evsignal_new 和 evtimer_new，其实它们都是定义在 include/event2/event.h中的宏，都是利用event_new这个函数，并且加上不同的参数的：
#define evsignal_new(base, signum, callback, arg) \ event_new((base), (signum), EV_SIGNAL|EV_PERSIST, (callback), (arg)) #define evtimer_new(base, callback, arg) \ event_new((base), -1, 0, (callback), (arg))
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原文地址：http://www.cnblogs.com/charlesblc/p/5561059.html
